/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Online.h
Get the interface for accessing the external UIs of a service
Interface pointer for the appropriate external UI service
namespace Online { static [IOnlineExternalUIPtr](API\Plugins\OnlineSubsystem\IOnlineExternalUIPtr) Online::GetExternalUIInterface ( const [FName](API\Runtime\Core\UObject\FName) SubsystemName ) }